Co-Authors:
Rosov, A., Institute of Animal Science, A.R.O., The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Gootwine, E., Institute of Animal Science, A.R.O., The Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
Abstract:
We evaluated the contribution of the American Suffolk, a known terminal sire breed, to growth traits of lambs born to Afec-Assaf ewes. By contemporaneous comparisons during 10 lambing periods, birth weight, preweaning and postweaning Average Daily Gain (ADG) of Afec-Assaf lambs (n=1301), 1/2 Suffolk lambs (n=98), 1/4 Suffolk lambs (n=598) and 1/8 Suffolk lambs (n=237) were compared. On average (mean ± SD) lambs' birth weight, weaning age, weaning weight, final weight and final age were 4.5 ± 1.2. kg, 35 ± 6 days, 14.7 ± 3.3. kg, 54.7 ± 8.2. kg and 153 ± 12 days, respectively. Preweaning, postweaning and overall ADG was: 294 ± 66, 343 ± 62 and 330 ± 53. g/day, respectively. Birth weight of 1/2 Suffolk, 1/4 Suffolk and 1/8 Suffolk lambs, all born to Afec-Assaf ewes, did not differ (P>0.05) from that of Afec-Assaf lambs. Lambs belonging to the 1/2 Suffolk and 1/4 Suffolk crosses had higher (P<0.05) preweaning and postweaning ADG than Afec-Assaf lambs. The difference in total ADG between Afec-Assaf and 1/2 Suffolk lambs was about 22. g/day, leading to an estimated body weight difference of 3.3. kg between lambs of the two genotypes at the age of 150 days. Genetic analysis suggested no significant (P>0.05) differences between the Suffolk and Afec-Assaf in birth weight or in postweaning ADG. However, additive, heterosis and recombination effects significantly (P<0.05) contributed to the difference between the two genotypes in preweaning ADG, and additive and heterosis effects significantly (P<0.05) contributed to the difference between the two genotypes in total ADG. © 2013 Elsevier B.V.
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